Cultivatok



Jan. 9, 1940. w JOHNSON Re. 21,317 CULTIVATOR Original Filed June 17,1952 mfllllllll'll II 'l/l/A G I ATTbRNEYS.

Reissued Jan. 9, 1940 UNITED STATES PATENT OFFICE CULTIVATOR Theodore W.Johnson, Moline, Ill., assignor to Deere & Company, Moline, 111., acorporation of Illinois Original No. 1,946,403, dated February 6, 1934,,Serial No. 617,710, June 17, 1932. Reissue No. 19,762, dated November19, 1935, Serial No. 738,329, August 3, 1934. This application forreissue November 13, 1939, Serial No. 304,195

' 33 Claims. o1. 97 47) The present invention relates to cultivators,and more particularly has to do with the shovel carrying rigs and themeans for mounting said rigs on the implement frame.

It has been found in the use of cultivators that in order to secure thebest performance and a steady operation of the cultivator shovelscarried by the rigs the rear shovel should operate slightly deeper thanthe front shovel during the cultivating operation, regardless of thedepth of cultivation for-which said rigs are set. It is also desirablethat as each rig rises and falls in following the contour of the groundover which it is operating that this same relationship of the severalshovels of the rig be maintained; i. e., the rig moving substantiallyparallel to itself within the range of its vertical movement when inworking position in the ground with each of the shovels of the rigoperating at the same relative depth at all times. Whenthe implement isoperating under load, that is, with the rigs in operating position inthe ground, all slack in-the connections between the rig and theimplement frame is taken up due to the resistance encountered in movingthe shovels through the ground. The slack present in the variousconnections permits the rig itself to rotate slightlyin acounterclockwise direction as shown in the accompanying drawing, andfurthermore, all strains in the members themselves tend to permit aslight counterclockwise movement of the rig. For this reason it isdesirable that the rig itself, when under no strain such as that imposedduring the cultivating operation, be carried on the frame by itssupporting linkage in a downwardly and rearwardly inclined position,such'inclination being suiiicient so that when all the slack in theconnections is taken up and the beam is straightened by theload, theshovels of the rig will be positioned with the rear shovel slightlylower than the front shovel. It isalso desirable that when the rigs arein their lifted or non-working position that the rear shovels thereof becarried at least as high, or even slightly higher, than the frontshovels.

With the foregoing in view, therefore, my invention has for itsprincipal object toprovide improved means for connecting the shovelcarrying rigs with the draft member of the implement frame whereby allof the above noted desirable advantages will be attained.

A further object of the invention is to provide improved means forsecuring the gauge wheelto the rig beam.

A still further object of-the-invention isto 'pro v vide improved meansfor adjusting the inclination or angular position ofthe longitudinallyextending rig beam relative to its supporting linkage to compensate forvariations which may occur in the several parts in the manufacturethereof.

Other objects and advantageous features will be apparent from thefollowing description of the preferred structural embodiment of myinvention taken in connection with the accompanying drawing, in which:

Figure 1 is a side View of a cultivator rig-and its connections with theimplement draft member and lifting rock shaft, and illustrating the rigwith its shovels in cultivating position below the ground surface;

Figure 2 is a similarview illustrating the rig in raised or transportposition, and also illustrating in dotted lines theangular positionsassumed by the longitudinally extending beam of the rig which carriesthe earth working shovels relative to the horizontal when in itslowermost and uppermost working positions in the ground and when partlyraised to transport position; and

Figure 3 is a horizontal sectional view taken on the line 33 of Figure 2showing the front shovel of the rig and the gauge wheel in plan, andillustrating the'means for securing the proper angular adjustment ofthe'rig beam relative to its supporting means.

The present invention hasto do onlywith my improved cultivator rig andthe means for supporting it from'theimplement, but such other partsasare necessaryto a complete understand-v ing of the present inventionhavebeen'illustrated and will be described herein. The transverselyextending draft member or bar which, 'in the ordinary form ofcultivator, is adapted to support a plurality of cultivator rigs, isshown in end elevation and indicated by the numeral 5. A suitablecasting 6 provided with a sleeve portion '1 engaging over said draftmember and secured thereto by a bolt 8 extending transversely throughthe sleeve and draft member supports the rig from said draft member aswill be hereinafter described.

An arm 9 projects upwardly and rearwardly from each sleeve 1 and has abearing boss H formed at its upperend. Rotatably mounted in the bearingboss I! is a square rock shaft "I2, by the operation of which rock shaftthe rig is raised and lowered as will be hereinafter described. Thesleeve 1 is also provided with a downwardly and forwardly extending arm13 positionedin alignmentwith the arm 9 as shown,

and I! disposed in a substantially longitudinalm: vertical plane andwhich support the lower portion of the cultivator rig.

The upper link I1 has its forward end bent laterally to pass through thebearing I5,.such

bent end receiving a cotter pin or any other suitableretaining device onthe opposite side of the bearing, as will be readily understood. Theforward end of the lower link I6 is pivotally mounted between thebifurcated ends of the bearing pertion I4 by a pivot bolt I8, and thisend of the link.

is formed with a flattened portion of considerable area contacting withthe fiat surfaces of the bifurcated portions I4, whereby side play ofthe link I6 is substantially eliminated and the rig is accurately heldin the desired plane or line of travel.

This sleeve construction and the manner of connecting the forward endsof the links I6 and H to the sleeve is similar to that shown anddescribed inrny prior Patent No. 1,958,625, issued May 15, 1934. I I

In the present construction I have provided improved means forsupporting the various shovel beams and gauge wheel of the rig on therear ends of the links I6 and H, such means comprising a pair ofsubstantially L-shaped parallelplates I9 and2I having their baseportionssecured together by means of bolts 22 and 23 extending through alignedopenings therein, said plates being held in suitable spaced relation toeach other, as best shown in Figure 3, by the forward end of alongitudinally extending shovel supporting member in the form of a beam24 also provided with aligned openings therein for receiving the bolts22 and 23, whereby the beam is supported from said plates. As shown, thebeam 24 is provided with a pair of earth working shovels 25. b When therearwardly extending shovel beam 24 is notused, as is sometimesdesirable as shown for instance in my prior Patent No. 1,946,402, issuedFebruary 6, 1934, suitable spacing sleeves (not shown) are mounted onthe bolts 22 and 23 between the plates I9 and 2| to hold said plates inproper spaced relation to each other. While it isold to providevertically spaced links such as links similar to those indicated at I6and H for supporting the lower portion of the cultivator rig from theimplement draft bar, it has been found that by suitably positioning thepivotal connec-- tions of such links with the plates I9 and 2| asillustrated in Figures 1 and 2 of the drawing the above mentionedadvantageous features, namely, the rear shovel of the rig operatingslightly deeper than the front shovel thereof when the rig is in workingposition, the rig moving substantially parallel to itself in alloperating positions of the rig, and the rear shovel of the rig beingelevated higher than the front shovel thereof when the rig is raised toinoperative or non-working position, are attained. The links I6 and I1are of substantially equal length and diverge slightly to ward theirrear ends which are pivotally connected with the upwardly extending armsof the plates I9 and 2| on pivot centers spaced farther apart than thepivot centers of the forward ends of said links as will now bedescribed. The rear end of the lower link I6 is journaled between saidplates I9 and 2| on a pivotbolt 26 while the rear end of the upper linkI1 is bent laterally, such lateral bent portion extending throughaligned openings provided therefor in the vertically extending arms ofthe plates I9 and 2| and being secured in position therein by means of acotter pin or other suitable retaining device on the opposite side ofthe plate 2|, as will be readily understood.

, aligned perforations for receiving a square tool shank or cross arm 29that extends transversely of the implement and is held rigidly in anytransverse position of adjustment in said plates by ,means of a U-bolt29 positioned between the plates I9 and 2|, as shown in Figure 3. Thelower ends of said U-bolt 29 pass through aligned holes in a plate 3 I-extending across and bearing against the two lower edges of the platesI9 and 2| and nuts 32 (see Figure l) are provided on the threaded endsof said U-bolt below said plate 3| whereby by tightening the nuts 32 thetool shank 28 is rigidly secured in position in saidv plates as will bereadily understood. This clamping mechanism for the transverse toolshank is similar to that described in' my prior Patent No. 1,946,402,above referred to.

The lower link I6 is also shown as curved upwardly about midway betweenits ends, as indicated'at I60. in Figure 1, such curvature beingprovided for the purpose of securing a higher lift of the earth workingshovels of the rig in the raising operation before interference isencountered by such links striking the top of the U-bolt 29, as will bereadily understood. One end of the tool shank or cross arm 28, as shownat thetop in Figure 3, is shaped to provide one element 34 of a clampingdevice between which and the other element 35 of the clamping device ashank 36 1claiying the front earth working shovel 31 is Clampjed on theopposite end of the square cross arm 28 on the other side of the platesI9 and 2| from that of the shovel 31 is a suitable casting 3B which isfixedly secured to the cross arm by means of a bolt 39. A verticallyextending sleeve 4| is formed in the forward portion of the casting 38and supports the vertical spindle 42 of a castering gauge wheel 43. Thedepth at which the shovels of the rig are operated is determined by theparticular one of the holes provided in the vertical spindle 42 in whichthe cotter pin 44 is positioned, as will be readily understood. Suchholes are illustrated in dotted lines in Figure 1 and indicated by thenumeral 40.

The rig is raised and lowered by the turning of the rock shaft I2 whichis accomplished by any suitable means not shown, and for this purposesaid rock shaft is provided with a rear-wardly extending arm 45 securedthereto so as to rock therewith and having secured thereto adjacent itsrear end one end of a chain 46, the opposite end of which is secured tothe plate I9 as indicated at 41 in Figures 1 and 2.

As it is desirable to provide for adjusting the inclination or angularposition of the longitudinally extending shovel beam 24 relative to theimplement frame to take care of possible variations occurring in themanufacture of the links I6 and I1 and the plates I9 and 2|" and also totake care of wear in the links and associated parts, suitable means hasbeen incorporated in the implement for that purpose. The openingprovided in the rig beam 24 for receiving the bolt 23 is made largeother.

enough to receive a cylindrical bushing 5| having an off-center bore 52which is made square in cross section to receive the intermediateportion 53 of the bolt 23 which is likewise of square cross section tofit snugly in the bore of the bushing. A small bushing 54 is provided onthe reduced end portion 55 of the bolt to center the bolt in theperforation provided therefor in the plate I9. Such reduced end 55 ofthe bolt is threaded and is provided with a nut 56 for clamping theparts in position, a washer 51 being interposed between the nut and theplate i9. By loosening the nut 55 and turning the bolt 23 in the properdirection the bushing 5| will turn with the nut thereby causing the beam24 to rotate a slight amount about the bolt 22, thereby adjusting itsangular position relative to the plates is and 2! and the implement as awhole, as will be readily understood.

In Figure 1 the rig is shown in lowered or working position and it willbe noted that the rear end of the rig is slightly lower than the frontend whereby the rearmost-shovel 25 of the rig operates slightly deeperthan the front shovel 31 thereof, while in Figure 2 the rig is shown inits elevated or inoperative position and it is to be noted that when insuch position the rear end of the longitudinally extending beam 24 iscarried considerably higher than the front end, whereby the rearmostshovel 25 is elevated considerably higher above the ground surface(indicated in the drawing by the reference letter G) than is the frontshovel 31. In Figure 2 is illustrated in dotted lines the variouspositions assumed by the beam 24 when in working position, and also theposition of the beam approximately midway between working position andraised or inoperative position. The dotted line position indicated bythe reference letter O is the operating position of the beam when it isfollowing through a low place, while the dotted line position of thebeam 24 indicated by the reference letter H represents its position whenit is following over a ground surface of higher elevation than thegeneral ele- 11. vation of the ground on which the tractor or implementwheels are supported. The dotted line positions indicated by thereference letters 0 and H, therefore, represent the normal range offloating movement that the rig has during operation. It is to be notedthat such dotted line positions are substantially parallel with each Thedotted line position of the beam 24 indicated by the reference letter Ishows a position of the beam 24 intermediate the position indicated bythe reference letter H and the full lift position of the beam as shownin full lines. It is to be noted that as the beam moves from theposition indicated by the reference letter H towards its full liftposition the rear end of the beam moves upwardly at a more rapid ratethan does its forward "end, so that when the beam is in full liftedposition the rear shovel of the beam is raised an appreciable extentmore than the front shovel thereof above the ground surface;

In the preferred embodiment this advantageous result is secured bydisposing the links l6 and I! so that their pivot points with the arm l3and plates l9 and 2| form a trapezoid in which the length of the linksl8 and II are equal but the distance between the front pivots is lessthan the distance between the rear pivots. In the normal or operatingposition of the rigs the links l6- and I! make approximately the sameangle with the members l9 and 2|. This is the position in which the rigbeams move substantially parallel to themselves, but after the beamshave been raised a material amount these angles are no longerapproximately equal and the rear ends of the beams then are raised at anincreasing rate, this increase being proportional to the differencebetween the angles. In the illustrated embodiment the links are almostbut not quite parallel and are so arranged that when the rig isin normalor operating position the links are substantially perpendicular to theplates l9 and 2!. Being almost perpendicular, for this position atleast, the rig will move substantially parallel to itself for a givenrange, but after this range has been exceeded the rig beam will be swungthrough an increasing angular displacement, as illustrated in Figure 2.

While I have shown and described the preferredembodiment of my inventionit will be apparent that my invention is not to be limited to thespecific means shown and described but that, in fact, widely differentmeans may be used in the practice of the broader aspects of myinvention.

What I claim, therefore, and desire to secure by Letters Patent is:

1. An agricultural implement comprising a transversely extending draftbar, an arm fixed to said bar, a cultivator rig, means for raising andlowering said rig, and means separate from said first named means andcomprising a pair of nonparallel links, both having free pivotalconnection with said arm and the rig-for supporting said rig from saiddraft bar whereby the rear shovel of the rig will operate deeper thanthe front shovel thereof when in operating position and will be raisedhigher than said front shovel when the rig is raised to inoperativeposition.

2. An agricultural implement comprising a transversely extending draftbar, an arm fixed to said bar, a cultivator rig, means supporting saidrig from said draft bar, said means comprising a pair of verticallyspaced links having free pivotal connection with the rig and with theupper and lower portions of said arm, the points of pivotal connectionbetween the rig and the links being spaced farther apart than the pointsof pivotal connection between the links and the arm on said raft bar,whereby the rear shovel of the rig will operate deeper than the frontshovel thereof when in operating position and will be raised higher thansaid front shovel when the rig is raised to inoperative position, andmeans separate from said supporting means for raising and lowering saidrig.

3. An agricultural implement comprising a transversely extending draftbar, an arm fixed to said bar, a cultivator rig having shovels, a pairof vertically spaced links pivotally supporting said rig from said arm,the rig being arranged with the rear shovel lower than the front shovel,said links being of equal length and inclining upwardly and convergingforwardly when the beam is in operating position, whereby the rearshovel of the rig will be raised higher than said front shovel when therig is raised to inoperative position, and means supported on said armseparately from said links for raising and lowering said rig.

4. An agricultural implement comprising a transversely extending draftbar, an arm fixed thereto, a cultivator rig, means supporting said rigfrom said draft bar, said means comprising vertically spaced links ofequal length and pivotally connected with the rig and with said armabove and below said draft bar, the points of pivotal connection betweenthe rig and the links being spaced farther apart than the points ofpivotal connection between the links and the arm, whereby the rearshovel of therig will operate deeper than the front shovel thereof whenin operating position and will be raised higher than said front shovelwhen the rig is raised to inoperative position, and means carried bysaid draft bar and connected with said rig separate from said supportinglinks for raising and lowering said rig.

5. An agricultural implement comprising a transversely extending draftbar, an arm fixed thereto having a lower bifurcated end, a cultivatorrig, means carried by the upper end of said arm for raising and loweringsaid rig, and means separate from said raising and lowering means andcomprising a pair of vertically spaced nonparallel links having freepivotal connection with said arm, one being connected with saidbifurcated end while the other link is connected with the upper portionof said arm below said raising and lowering means, said links alsohaving free pivotal connection with said rig for supporting said rigfrom said arm whereby when the rear shovel of the rib ispositioned tooperate deeper than the front shovel thereof in working position theshovels will maintainsuch relationship in all the normal range offloating movement of the rig in operationand the rear shovel will beraised higher than the front shovel when the rig is raised toinoperative position.

6. An agricultural implement comprising a transversely extending draftbar, an arm fixedly 35' secured thereto, a. cultivator rig, meanscarried by said bar for raising and lowering said rig, and meansseparate from said first named means pivotally supporting said rig fromsaid arm for floating movement, said means comprising a pair ofvertically spaced links having free pivotal connection with said arm andwith the rig, the points of pivotal connection between the rig and thelinks being spaced farther apart than the points of pivotal connectionbetween the links and the draft bar, and the rear shovel of the rigbeing positioned to operate deeper than the front shovel thereof, theangular relation between the links being such that the shovels: willmaintain such relationship in all normal range of floating movement ofthe rig in operation and the rear shovel will be raised higher than thefront shovel when the rig is raised to inoperative position.

'7. An agricultural implement comprising a transversely extending draftbar, an arm fixedly secured to said draft bar andhaving at its lower endtwo laterally spaced depending portions, a cultivator rig, said rigincluding two laterally spaced plate members, means connected with saidplate members for raising and lowering said rig, and a pair ofvertically spaced links pivotally supporting said rig from said draftbar for free floating movement, the lower of said vertically spacedlinks being disposed between said depending portions on the arm andbetween said laterally spaced plate members on the rig, the rear shovelof the ring beingarranged to operate deeper than the front shovelthereof when in operating position and said links being arrangedsubstantially perpendicularly with respect to a line joining the pointsof their connection with the rig when the latter is in operatingposition but converging forwardly, whereby the rear shovel of the rigwill be raised higher'than the front shovel when the rig is raised toinoperative position byswingingsaid links upwardly from theirsubstantially perpendicular position,

8. An agricultural implement comprising a transverse-1y extending draftbar, a cultivator rig including a pair of vertically extending platesand a longitudinally extending rig beam, means connecting said platestogether in spaced relation with respect to each other, and meanspivotally supporting said rig from said draft bar, said means comprisingtwo vertically spaced links converging forwardly when the rig is inoperating position and pivotally connected at their rear ends with saidpair of plates, the lower of said links being disposed between saidplates while the other link is disposed adjacent one side thereof, saidlinks making substantially equal angles with said plates when the rig isin operating position but having their front ends pivoted at pointscloser together than their rear ends whereby the rear end of the beamwill be raised higher than the front end when the rig israised toinoperative position, and means disposed alongside the upper of saidlinks and connected with said plates for raising and lowering said rig.

9. A cultivator rig comprising a pair of vertically extending spacedplates, a longitudinally extending tool carrying beam, and means forsecuring the forward end of said beam between said plates, said meansincluding parts shiftable between the plates operative to adjust saidbeam angularly relatively to said plates.

10. A cultivator rig comprising a pair of vertically extending spacedplates, a longitudinally extending tool carrying beam disposed betweensaid plates and extending rearwardly therefrom, a pair of boltsconnecting said beam with said plates, and means carried by one of saidbolts for adjusting said beam angularly relatively to said plates.

11. A cultivator rig comprising a pair of vertically extending spacedplates having aligned openings therein, a longitudinally extending toolcarrying beam pivotally supported between said plates and extendingrearwardly therefrom, said beam being provided with an opening aligningwith openings in said plates, a bolt extending through said alignedopenings in the plates and beam for securing said beam in fixed positionbetween said plates, and an eccentric bushing rotatable in the openingin the beam and movable with the bolt whereby by turning said bolt saidbeam may be adjusted angularly relatively to said supporting plates.

12. A cultivator rig comprising a pair of vertically extending spacedplates, a longitudinally extending tool carrying beam supported at itsforward end between said plates and extending rearwardly therefrom,forwardly extending members formed integrally with said plates andhaving aligned openings therein, a transversely extending cross arm,extending through said aligned openings, an earth working tool securedto said arm on one side of said plates, and a gauge wheel secured tosaid arm on the opposite side of said plates.

13. A cultivator rig comprising a pair of vertically extending spacedplates, a longitudinally extending tool carrying beam supported at itsforward end between said plates and extending rearwardly therefrom,forwardly extending members formed integrally with said plates andhaving aligned openings therein, a transversely extending tool carryingmember extending through said aligned openings, means for adjustablysecuring said member in position in said extending in oppositedirections from its point plates, an earth working tool secured to saidmember on one side of said plates, and a gauge wheel secured to saidmember on the opposite side of said plates.

14. A cultivator rig comprising a pair of vertically extending spacedplates, a longitudinally extending tool carrying beam supported at itsforward end between said plates and extending rearwardly therefrom,forwardly extending members formed integrally with said plates andhaving aligned openings therein, av transversely extending tool carryingmember extending through said aligned openings, an earth working toolsecured to said member on one side of said plates, and a castering gaugewheel secured to said member on the opposite side of said plates.

15. A cultivator rig comprising a supporting member, a transverselyextending arm carried by and extending outwardly from opposite sides ofsaid member, an earth working tool supported on one end of said arm, anda gauge wheel supported at the opposite end of said arm.

16. A cultivator rig comprising a supporting member, a transverselyextending arm carried by and extending outwardly from opposite sides ofsaid member, an earth working too-l supported on one end of said arm, agauge wheel supported at the opposite end of said arm, and alongitudinally extending tool carrying beam having its forward endsecured to said supporting member.

17. A cultivator rig comprising a supporting member, a transverselyextending cross arm carried by and extending outwardly from oppositesides of said member, an earth working tool supported on one end of saidcross arm, a gauge wheel supported at the opposite end of said crossarm, a longitudinally extending tool carrying beam having its forwardend secured to said supporting member, and means for adjusting said beamangularly relatively to said supporting member.

18. A cultivator rig comprising a pair of vertically extending spacedplates, a longitudinally extending tool carrying beam, and means forsecuring the forward end of said beam between said plates, said meansincluding a rotatable member acting against the beam and reactingagainst said plates whereby said beam may be adjusted angularlyrelatively to said plates.

19. A cultivator rig comprising a supporting member, a transverselyextending arm carried by and extending outwardly from opposite sides ofsaid member, an earth working tool supported on one end of said arm, agauge wheel supported at the opposite end of said arm, and meansadjustably connecting said arm with said supporting member whereby oneadjustment of said arm simultaneously adjusts said tool and said gaugewheel.

20. A cultivator rig comprising a supporting member, a transverselyextending arm carried by said member, an earth working tool carried bysaid arm, a gauge wheel carried by said arm, and means adjustablyconnecting said arm with said member whereby adjustment of Said armsimultaneously adjusts said tool and said gauge wheel.

21. A cultivator rig comprising vertically extending plate means, alongitudinally extending tool carrying beam, means connecting theforward end of said beam with said plate means, and means shiftable withrespect to said plate means and operative thereby to adjust said beamrelative to said plate means. I

22. A cultivator 'rig comprising a supporting member, a tool carryingpart mounted on and.

of connection with said member, an earth-working tool mounted on saidpart adjacent one end thereof, and gauge means supported on said part:adjacent the other end thereof.

23. A cultivator rig comprising a supporting and means adjustablyconnecting said part with said member whereby'adjustment of said partsimultaneously adjusts saidtool and said gauging means.

24. A cultivator unit for tractor cultivators comprising a supportingmember adapted to be v mounted on a tractor, a draft bracket mountedthereon, substantially parallel drag links pivotally connected to thedraft bracket at their forward ends in vertically spaced relation, atool bracket to which the rear ends of said links are pivotallyconnected, said tool bracket having a socket extending. therethrough, atool bar having its middle portion mounted in said socket for adjustmentaxially, a ground engaging depth gauge mounted on one end of the toolbar, and. a tillage tool mounted on the opposite end of the tool bar.

25. An agricultural implement comprising draft means, a cultivator rig,means. for raising and lowering said rig, and means separate from saidfirst-named means and comprising a pair of non-parallel links, bothhaving free pivotal connection with said draft means and with said rigfor supporting the latter from said draft means, whereby the rear toolof the rig will operate deeper than the front tool thereof when inoperating position and will be raised higher by said raising andlowering means than the front tool when the rig is raised to itsinoperative position.

26. An agricultural implement comprising a draft frame, a cultivator righaving tools, a pair of generally vertically spaced links pivotallysupporting said rig from said draft frame, the rig being arranged withthe rear tool lower than the front tool when in operating position, saidlinks. 1

being of substantially equal length and inclining upwardly andconverging forwardly when the rig is inits operating position, wherebythe rear tool of the rig will be raised higher than the front tool whenthe rig is raised to its inoperative position, andmeans carried by saiddraft frame separately from said links for raising and lowering saidrig.

27. A cultivator rig comprising a supporting member having a socket, atool bar carried in said socket and extending in opposite directionstherefrom, an earth-working tool carried by said tool bar on'one side ofsaid socket, and gauge means supported by said tool bar on the otherside of said socket.

28. A cultivator rig comprising a supporting member having a socket, atool bar carried by said member and movably disposed in said socket, anearth-working tool carried by said bar, gauging means also carried bysaid bar, and means adjustably securing said bar in said socket, wherebyadjustment of said beam simultaneously adjusts both said tool and saidgauging means relative to said supporting member.

29. An agricultural implement comprising a transversely extending draftbar, an arm fixed to said bar, a cultivator rig having front and reartools, means for raising and lowering said rig, a pair of plates fixedto said rig in spaced apart relation, and means separate from said firstnamed means and comprising a pair of non-parone end of the lower linkbeing disposed between said spaced apart plates, both of said linkshaving free pivotal connection with-said arm and the rig for supportingsaid rig from said draft,

the rig will operate deeper than the front tool thereof when inoperating position and will be raised higher than saidfront tool whenthe rig is raised to inoperative position.

30. An agricultural implement comprising a transversely extendingdraftbar, an armflxed to said bar andhaving a lower bifurcated portion,a cultivator rig having front and rear tools,

means for raising and lowering said rig, a pair of,

upwardly extending plates fixed to said rig in spacedapart relation, andmeans separatefrom said first named means and comprising a pair ofvertically spaced non-parallel links, the upper link having free pivotalconnection at its ends with said arm and said rig, the rear end of thelower link being disposed between said spaced plates and the forward endof said lower link being disposed within the bifurcated portion of saidarm, whereby the rig is'held substantially rigid against lateraldeflections, said non-parallel links being arranged whereby the reartool of the rig will operate deeper than the front tool thereof when inoperating position and will be raised higher than said front tool whenthe rig is raised in inoperative position 31. An agricultural implementcomprising a transversely extending draft bar, an arm fixed thereto andhaving a lower bifurcatedportion, a

cultivator rig having front and rear tools, means for raising andlowering said rig, a pair of plates fixed to said rig in spaced apartrelation, and means separate from said first named'means and comprisinga pair of generally vertically spaced links, one end of the lower linkbeing disposed between said spaced plates and the other end beingreceived within, the bifurcated portion of said arm, whereby the rig isheld substantially rigid against lateral deflections, one end of theupper link being pivotally connected to said arm and the other end beingpivoted to at least one of said plates, said links being non-parallelallel links disposed in vertically spaced relation, whereby" the reartool of the rig will operate deeper than the front tool thereof when inoperating position and will be raised higher than said front tool whenthe rig is raised to inoperative position. i

against lateral deflection while the other link is disposed adjacent oneside of one of the plates,

said links being arranged in non-parallel relation whereby the rear endof the rig will be raised higher than the front end when the rig israised to inoperative position and willbe disposedlower than the frontend when the rig is in operating position.

33. An agricultural implement comprising a draft frame, a cultivatorrighaving tools, a pair of generally laterally-spaced plates fixed tosaid cultivator rig, an arm having a bifurcated portion forming a partof said draft frame, a pair of generally vertically spaced linkspivotally supporting said rig from said draft frame, said lower linkcomprising a flat'bar having one end disposed in the bifurcated portionof said arm and the other end disposed between said laterally spacedplates, the upper link being pivotally connected at its ends to said armand at least one of said plates and said upper link being disposedalongside-said arm and one plate, respectively, the rig being arrangedwith the rear tool lower than the front tool when in operating position,

said links being of substantially equal length and

